/*
 * Created on Feb 8, 2007
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.gudy.azureus2.core3.util.Debug;

public class DeleteFileOnCloseInputStream extends InputStream {
    private InputStream in;
    private File file;
    private boolean closed;

    private long pos;
    private long mark;

    public DeleteFileOnCloseInputStream(File _file)

    throws IOException {
        file = _file;
        in = new BufferedInputStream(new FileInputStream(file), 128 * 1024);
    }

    public void close()

    throws IOException {
        if (closed) {

            return;
        }

        closed = true;

        try {
            in.close();

        } finally {

            if (!file.delete()) {

                Debug.out("Failed to delete file '" + file + "'");
            }
        }
    }

    public int read()

    throws IOException {
        int result = in.read();

        pos++;

        return (result);
    }

    public int read(byte b[])

    throws IOException {
        int res = read(b, 0, b.length);

        if (res > 0) {

            pos += res;
        }

        return (res);
    }

    public int read(byte b[], int off, int len)

    throws IOException {
        int res = in.read(b, off, len);

        if (res > 0) {

            pos += res;
        }

        return (res);
    }

    public long skip(long n)

    throws IOException {
        long res = in.skip(n);

        pos += res;

        return (res);
    }

    public int available()

    throws IOException {
        return (in.available());
    }

    public synchronized void mark(int readlimit) {
        mark = pos;
    }

    public synchronized void reset()

    throws IOException {
        in.close();

        in = new FileInputStream(file);

        in.skip(mark);

        pos = mark;
    }

    public boolean markSupported() {
        return (true);
    }

    /**
     * @return
     * 
     * @since 3.1.1.1
     */
    public File getFile() {
        return file;
    }
}